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CVE-2021-26085 : What You Need to Know

Learn about CVE-2021-26085 affecting Atlassian Confluence Server versions before 7.4.10 and from 7.5.0 before 7.12.3. Understand the impact, technical details, and mitigation steps.

This article provides details about CVE-2021-26085, a vulnerability found in Atlassian Confluence Server that allows remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability.

Understanding CVE-2021-26085

CVE-2021-26085 is a security vulnerability identified in Atlassian Confluence Server, affecting versions before 7.4.10 and from version 7.5.0 before 7.12.3. The vulnerability enables remote attackers to access restricted resources.

What is CVE-2021-26085?

Affected versions of Atlassian Confluence Server allow unauthorized users to view restricted content through a vulnerability in the /s/ endpoint, known as Pre-Authorization Arbitrary File Read.

The Impact of CVE-2021-26085

This vulnerability can be exploited by remote attackers to access sensitive information on the Confluence Server, potentially leading to unauthorized data exposure and privacy breaches.

Technical Details of CVE-2021-26085

The following technical aspects highlight the vulnerability in Atlassian Confluence Server:

Vulnerability Description

The vulnerability arises from improper access controls in the /s/ endpoint, allowing unauthorized users to read restricted files.

Affected Systems and Versions

Atlassian Confluence Server versions before 7.4.10 and from 7.5.0 before 7.12.3 are susceptible to this security flaw.

Exploitation Mechanism

Remote attackers can exploit this vulnerability by sending crafted requests to the /s/ endpoint, bypassing authentication and gaining access to unauthorized files.

Mitigation and Prevention

To enhance security and prevent exploitation of CVE-2021-26085, consider the following measures:

Immediate Steps to Take

        Update Atlassian Confluence Server to version 7.4.10 or higher to mitigate the vulnerability.
        Implement strict access controls and ensure proper authorization mechanisms are in place.

Long-Term Security Practices

        Regularly monitor for security updates and patches released by Atlassian.
        Conduct security assessments and audits to identify and address potential vulnerabilities proactively.

Patching and Updates

Stay informed about security advisories from Atlassian and promptly apply patches to secure the Confluence Server.

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